The destruction of the Vortha prompted the Klingon High Council to send a fleet under command of Kor, son of Rynar to take Organia for the Empire and destroy the Enterprise. The Enterprise arrived at Organia shortly before the Klingons, but was forced to depart when the fleet did arrive, leaving CaptainKirk and Mr. Spock stranded on the planet.

While the Klingons established their rule over the planet Kirk and Spock donned disguises, and after being interrogated by the Klingons were allowed to go about their business - with Kirk in the guise of Baroner being appointed Goveror Kor's liaison to the Organian people.

The Klingons’ peaceful conquest did not last long when Kirk and Spock decided to try and spark an Organian resistance by blowing up the Klingons’ ammunition depot. The Klingons discovered Kirk's true identity and took him into custody, but the Organian leader, Ayelborne, freed them. The two acts of apparent Organian terrorism prompted Kor to order two-hundred Organians be shot in punishment, and order more be periodically killed until the Starfleet spies turned themselves in.

Federation and Klingon forces face off over Organia

Horrified by the deaths Kirk decided to make a strike against Kor and attacked him in his base of operations on the planet. At the same time the Federation fleet arrived above the planet to face off against the Klingons. Appalled by the escalating violence the Organians, who were (unknown to both powers) in fact non-corporeal beings, decided to intervene and prevented the continuation of immediate hostilities by making it impossible for the Starfleet and Klingon forces to fight by making their weapons too hot to touch. At the same time Ayelborne simultaneously appeared before the Federation and Klingon leadership to impose a peace treaty on the two powers to prevent further violence. (TOSepisode: "Errand of Mercy"; TOS - Klingons: Blood Will Tellcomic: "Against Their Nature")

In 2269, the Klingons confined Organia with a "thought-barrier", thus allowing war to break out between the Federation and Klingons once again. After the Enterprise reached Organia and freed it, the Organians confined the Klingons to their homeworld for 1000 years. (TOSnovel: Spock Must Die!)

In the 2280s, Starfleet dispatched a small starship to investigate the suspected disappearance of the Organians. Upon arriving at the world, the Starfleet captain found all traces of them gone, and was confronted by a Klingon picket ship. The Starfleet crew destroyed the hostile Klingon and reported the abandonment of Organia. (TOSvideo game: Starfleet Command: "Errand of Curiosity")